.main {
  overflow: auto;
}
td,
th {
  /* 设置td,th宽度高度 */
  width: 190px;
  height: 30px;
}
th {
  background-color: #F8F8F9;
  border: 1px solid gray;
}
table {
  table-layout: fixed;
}
td:first-child,
th:first-child {
  position: sticky;
  left: 0;
  /* 首行永远固定在左侧 */
  z-index: 100;
}
td:last-child,
th:last-child {
  position: sticky;
  right: 0;
  /* 首行永远固定在左侧 */
  z-index: 1;
  width: 480px;
}
thead tr th {
  position: sticky;
  top: 0;
  /* 列首永远固定在头部  */
}
.drop_down_xingm{
  height: 40px;
}